In this study, all energy in the universe, here called energy quanta, originates from a singularity at the centre of the universe. The electron and the atom are completely passive;they absorb energy quanta by means of forced damped oscillators and the absorbed energy quanta are then re-emitted. Absorbed and stored energy quanta result in nuclear energy. Re-emitted energy quanta are fields. Re-emitted energy quanta operating on oscillators, in adjacent particles and atoms, result in forces: strong force, Coulomb force and gravitational force. Using this model may enable unification of elementary particle physics, general relativity, electromagnetic theory and quantum physics into one comprehensive theory.